The remote host is missing an update to websvn announced via advisory DSA 1725-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201725-1

Bas van Schaik discovered that WebSVN, a tool to view Subversion repositories over the web, did not properly restrict access to private repositories, allowing a remote attacker to read significant parts of their content. The old stable distribution (etch) is not affected by this problem. For the stable distribution (lenny), this problem has been fixed in version 2.0-4+lenny1. For the unstable distribution (sid), this problem has also been fixed in version 2.0-4+lenny1. We recommend that you upgrade your websvn package.